Carburetor



Oct. 19, 1948. N. G. LA GUARDIA '2,45563 I cAnBUnsTon Filed April 24, 1945 2 sheets-sheet 2 Zo l, i /l/ l /l' I di yg Y 44 0" l el! t I f 37 J2 2a 45 |I QT/, 5 2f I zo' J .ul? 5a j sa so' .f

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77 I i f @f- 7J da 75 MMS Patented Oct. 19, 1948 UNITED y STATES lPA'rlsN'r Vortica l CARBURETOB Nick G. La Guardia, Denver,- Colo. Application April 24.1945, Serial No. 590,043 l s claims. (ci. zei- 23) This invention relates to new and useful improvements in carburetors such as are employed on motor vehicles, especially the engines of aeroplanes, motor driven boats and automobiles.

The principal object of the present invention is to provide a carburetor which in the instance of an aeroplane will operate to supply fuel to the complemental engines regardless of the position of the engine. 1

Another important object is to provide a carburetor which under acceleration will function to pump fuel to the atomizer or atomizers of the carburetor.

Still another important object of the invention is to provide a carburetor in which the parts are related in such a manner as to be positive acting and substantially fool-proof at all times.

Other objects and advantages of the invention shall become apparent to the reader of the following description.

In the drawings: Figure 1 is a side elevational view of the improved carburetor.

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 1.

Figure 3 is a fragmentary vertical sectional view showing a modified form of the invention.

Figure 4 is a fragmentary vertical sectional view showing another form of the invention.

`Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes a vertically disposed shell having passageway 5, 1 extending vertically therein and opening through the top thereof. The passageways 6, 1 meet at the point 3 just under a jet 3, which is at the lower end of an intermediate chamber III. The lower end of the-shell 5 is constructed to form a neck II, flanged, as at I2, for attachment to an intake manifold pipe. 'I'he upper end of the shell 5 is flanged, as at I3, for attachment to an air filter (not shown).

In the upper portion of each passageway 6, 1 is a butterfly valve I4, these valves being mounted on a common shaft I5 operated by an arm I6 at one end thereof.

A conduit I1 extends from one side of the shell 5 across the passageway 6, and into the space I3 between the passageways 6, 1 and from there downwardly to communicate with a transverse passageway I3 which at its open ends projects into the passageways 6, 1.

At one side of the shell 5 is provided a bowl 23, having a vertically disposed partition 2| therein, dividing the interior of the bowl into chambers 22 and 23. The bottom of the bowl 22 has a 2 cleanout plug 24, while a fuel inlet connection burr 25 is provided at the upper portion thereof, through which fuel is supplied to the chamber 22. The upper portion of the chamber 22 is formed with a pocket 26, the lower portion of which is covered by a strainer 21.

A float 23 is swingably supported in the chamber 23, as at 23, and has an upstanding member 33 from which projects a needle valve 3i operating against a seat at one end of a. port 32 between the pocket 26 and the chamber 23. Thus it can be seen that the floated position of the float 28 in the chamber 23 regulates the admission of fuel to the chamber 23.

In the chamber 23 is a formation 33 which has a passageway 34 extending from the face thereof horizontally and then vertically to a valve seat 35 and a pocket 36. The conduit I1 communicates with the pocket 36. A screw valve 31 is 4feedable through acover 36 for the bowl 20 and an arm 33 is provided for the upper end of this screw 31. The arm 39 has an opening and a set screw whereby a control cable can be attached thereto.

A cylindrical bore40 is located in the formation 33 and accommodates a piston 4I. A rod 42 extends upwardly from the piston 4I and through thecover 33.

A rocker 43 is mounted on the cover 33 and has one end pivoted, as at 44, to the upper end of the 'piston rod 42, while the other end is adjustably secured, as at 45, to the upper end of a verticall slide rod 46 operating through a vertical guide 41.

The lower end of the rod 46 is provided with a head 43 riding a cam 49 located on one end of a horizontal shaft 50 which is disposed through the neck II of the shell 5 where it is provided with a butterfly v alve 5I. The other end of the shaft 50 carries a cam 52 which operates against a. rod 53, this rod operating vertically through a guide 64 and being connected by a pivotal link 55, at its upper end to the end of an arm 56 on the outer end of a shaft 51, which carries a butterfly valve 53 within thepassagewayv I1. Compression springs 60 and 6I are provided on the lower portions of the rods 46 and 63.

In the lower portion of the formation 33 in the chamber 23 are oppositely opening ball check valves 62, 63. On the upstroke of the piston 4I,

fuel is sucked into the cylinder 43 from the pasthe pressure of the pump and as air mixes with the same at the junction of the passageways 6, 1.v The numeral 65 denotes a small air tube extending from the upper portion of the air passageway I to the top of the chamber 2l.

Extending from the lower portion of the chamber. 23 is an idling fuel supply duct 51 which exl tends upwardly, as at 5 5, and then downwardly,

as at 5l. following the Wallof the neck Il, to an outlet 10 in the neck il where an adjusting valve 1i is provided.

It can now be seen, that under idling conditions, fuel is supplied from the bowl 23 through the duct 51, 58, 59 to the admission port 10.

However, under acceleration, depending upon the position of the valve 31, fuel is supplied to the point I in the shell 5 by way of the duct 54, valve 31, passageway I1 and transverse passageway I8 where it mixesv with air rushing down the pasageways 5, 1 while at the same time fuel under the pressure of the piston 4I is forced up the duct il and by way of the tube 65 into the chamber i and atomizes out through the jet 9 to mix at the point 8 with the downwardly rushing roughly mixed air and fuel. Both the piston ll. and the valve 58 are operated by the same manually controlled .shaft 50. Obviously, when a sumcient level of fuel has been reached in the chamber 23, the rising of the float 28 actuates the needle valve 5i to shut off the duct 32.

A modification of the invention is ,shown in Figure 3, this form of the invention showing a shell 5a having passageways 6a, 1a. and buttery valves Ila, lla in the upper portions thereof located on a common shaft |5a operated by an arm Ia. The shell 5a has a central chamber ia and inclined conduits i1a, Ila extend across the passageways 6a, 1a and opened to ports I8b formed through the wall of the chamber lila.l

Across the shell 5a is disposed a shaft 51a hav-= lng a butterfly valve 58a operating in the chamber Isa above a pair of jets I9a, isa terminating in the lower portions of the pasageways 6a, 1a. 'I'he lower end of the chamber I8a is formed to provide a jet 9a just above the converging point la of the passageways 5a, 1a.

In the lower portion of the shell 5a/is a neck lia having an idling fuel port 10a controlled by a screw valve 1Ia and in the neck lia just above the idling fuel port 10a is a control valve 5Ia.

'Obviously when the engine is in operation, air flows down the passageways 5a, 1a, some being bled through the ports I8b, lsb into the chamber I8a to mix with fuel arriving by way of the conduits 11a, ila. Inasmuch as the fuel entering by way of the passageway I1a is under pressure, the fuel will pass with considerable velocity through the jet 9a and some out of the feed jets I9a, to the end that there will be a corntion point equivalent to that of 5 or 8a in Figuresg2 and 3 is provided in the lower` portion of the shell 5b (not shown),

jet 11 projecting into the upper portion thereof with fuel supplied thereto by )conduits 18, 18, these conduits extending from a oat chamber 23 such as that shown in Figure 2. Butterfly control valves 11' are provided on a common shaft 88 and operated in the portions of the Venturi tubes 16. A jet such as the jet 9 or 9a with The lcarburetor of this invention, therefore, includes two vertically positioned air intake passages coming together at their lower ends'to form a common outlet with a butterfly valve in 4the common outlet and with butterfly valves in their upper inlet ends. A float chamber is positioned 'at one side of the carburetor and this is provided with a fuel connection and a float with a valve actuated thereby to control the flow of fuel into the float chamber, The carburetoris provid'ed with 'a connection to supply fuel for idling which extends from the lower end of the float chamber upward in the housing and thence downward to a point in the common outlet beyond the butterfly valve. The main fuel supply is provided through a passage that also extends from the lower end of the float chamber upward to a point midway of the height of the carburetor, and thence into a connection that discharges into the two air intake passages. This fuel supply connection is also provided with a control valve. In addition to the connection for the main supply of fuel and the fuel for idling, the carburetor is also provided with an accelerating cylinder with a piston therein actuated by a cam on the shaft of the butterfly valve in the common outlet and as this cam moves through the operation of the butterfly valve to the extreme position, it forces the piston in the cylinder downward, and in the compression stroke of the piston fuel is forced out of the lower end of the cylinder and through an auxiliary connection to an oriflce which forms a .iet between the two air intake passages and this auxiliary fuel is ejected into the common outlet. The air intake passages are normally open and unobstructed except for the extending end of the tubular connection I9 which restricts the area in the respective passages `at this point slightly, and in Figure 4 the areas of the air intake passages are definitely restricted by the centrally disposed tubes 16 which provide a Venturi action that accelerates the passage of the air therethrough and the fuel is supplied to the air at these constricted points or throats of the passages. The float chamber of the carburetor is also provided with a bleeder connection from the upper end thereof to the upper end of the air intake passages.

` While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be restorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. In a carburetor, the combination, which comprises a housing having a plurality of parallel air intake passages converging to a common outlet, butterfly valves in the intake passages, a butterfly valve in the outlet, a shaft with extending ends having cams on the ends thereof pivotally mounting said butterfly valve in said common outlet, said housing having a centrally disposed chamber with a discharge orifice in the vertex of a conical-shaped lower end thereof, said orifice aligned with the center of said common outlet, said housing including a oat chamber extending at one side of said intake passages and intermediate the ends thereof, a fuel supply connection communicating with the interior of asuntos the float chamber, a float in said float chamber, a valve in said fuel supply connection actuated by said float, said float chamber having an inner cylinder therein, a piston in said inner cylinder, levers actuated by one of the cams on the butterfly valve shaft to operate the piston in a compression stroke thereof, means resiliently returning the` piston, check valves in the cylinder in the float chamber admitting fluid to the cylinder in the returning stroke of the piston and providing release of fluid in the cylinder through a connection to the vertex of said centrally disposed chamber' of the housing as the piston is actuated through the compression stroke, said housing having a fluid supply connection from the lower end of the float chamber to the valve intake passages thereof, a control valve in said connection, a butterfly valve in said fluid supply connection, means actuating the but ,terfly valve inI said fluid supply .connection by one of the cams on said butterfly valve shaft, said housing having a passage for fuel for idling extending from the lower end of the float chamber upward to a point midway of the height of the housing and thence downward to a point in the common outlet beyond the butterfly valve there- 6 way of the height of the housing and thence downward to a point in the common outlet be- .vond the butterfly valve therein, and a control valve in said idling fuel passage.

3. In a carburetor, the combination, which comprises a housing having a plurality of parallel air intake passages having constricted areas intermediate their ends providing Venturi action therein, said passages converging to form a common outlet, butterfly valves in the intake passages, a butterfly valve in the common outlet, a

shaftwith extending ends having cams on said ends-'pivotally mounting said butterfly valve in said common outlet, said housing having a centrally disposed chamber having a discharge orifice in the vertex of a conical-shaped Ilower end thereof. said orifice aligned with the center of said-common outlet, said housing including a z float chamber extending at one side of said intake passages and intermediate the ends thereof, s aid housing also having a fuel supply connection communicating with the interior of the oat` chamber, a float in said float chamber, a valve in :said fuel supply connection actuated by said float,

in, and a control valve in said idling fuel passage.YV

2. In a carburetor, the combination, which comprises a. housing having a plurality of parallel air intake passages having constricted areas intermediate their ends providing Venturi action therein, said passages converging to form a common outlet, butterfly valves in the intake passages, a butterfly valve in the common outlet, a shaft with extending ends having cams on said Iends pivotally mounting said buttery valve -in said common outlet, said housing having a centrally disposed chamber having a discharge orifice in the vertex of a conical-shaped lower end thereof, said orifice aligned with the center of said common outlet, said housing including a float chamber extending at one side of said intake passages and intermediate the ends thereof, said housing also having a fuel supply connection communicating with the interior of the float chamber, a float in said float chamber, a valve in said fuel supply connection actuated by said float, said float chamber having an inner cylinder therein, a piston in said inner cylinder,

levers actuated by one vof the cams on the but' terfly valve shaft to operate the piston through a compression stroke thereof, means resiliently returning tle piston, check valves in the cylinders admitting fluid to the cylinder in the returning stroke of the. piston and providing release -of fluid in the cylinder through a connection to the vertex of said centrally disposed chamber of the housing in the compression stroke of the piston therein, said housing having a fluid supply connection from the float chamber to the constricted area of the air intake passages, a

control valve in said connection, a butterfly valve in said fluid suppy connection, means actuating the butterfly valve in the. fluid supply connection as the butterfly valve in the common outlet is actuated, said housing having a passage for fuel for idling extending from the loweryend of the float chamber upward to a point midsaid float chamber having an inner cylinder therein, a piston in said inner cylinder, levers actuated; by one of the cams on the butterfly valve shaft to operate the piston through a compression' stroke thereof, means resiliently returning the piston, check valves in the cylinders admitting fluid to the cylinder in the returning stroke of the piston and providing release of fluid in the cylinder through a connection to the vertex of said centrally disposed chamber of the housing in the compression stroke of the piston therein, said housing having a fluid supply con nection from the oat chamber to the constricted area of the air intake passages, a control valve in said connection, a. butterfly valve in said fluid supply connection, means actuating the butterfly valve in the fluid supply connection as the butterfly in the common outlet is actuated, said housing having a passage for fuel for idling 'extending from the lower end of the oat cber upward to a point midway of the height of the housing and thence downward to a point in the common outlet beyond the butterfly valve therein, `a control valve in said idling fuel passage, and a connection from the upper end of the float chamber to the upper end of the housing above the butterfly valve therein communicating with said intake passages.

r NICK G. LA GUARDIA.

REFERENCES CITED -"Ihe following references are of record in the' ille of this patent:

` UNITED STATES PATENTS 2,313,258 Olson Mar. 9, 1943 

